It saddens me that War of the Gargantuas is such a cult hit in America while the vastly superior film it's a loose sequel to, Frankenstein Conquers the World, gets far less attention. Part of the problem is that the English dub obscures that it's a sequel by dubbing over "Frankenstein" with "Gargantua" -- perhaps because American audiences would've been confused by seeing Bigfoot-like creatures referred to as Frankensteins. (More at my blog: https://christopherlbennett.wordpress.com/2016/02/03/thoughts-on-tohos-frankenstein-duology/ )